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      저자 : Will Ryan (검색결과 2 건)
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      • The effect of skin passing on the material behavior of metal strip in pure bending and tension

        Matthias Weiss,Will Ryan,Bernard Rolfe,Chunhui Yang 한국소성가공학회 2010 기타자료 Vol.2010 No.6

        The metal strip used in roll forming has often been preprocessed by (tension or roller) leveling or by skin-pass rolling, and as a consequence, may contain residual stresses. These stresses are not well observed by the tensile test, but could have a significant effect on the bending and springback behavior. With the advent of improved process design techniques for roll forming, including advanced finite element techniques, the need for precise material property data has become important. The major deformation mode of roll forming is that of bending combined with unloading and reverse bending, and hence property data derived from bend tests could be more relevant than that from tensile testing. This work presents a numerical study on the effect of skin passing on the material behavior of stainless steel strip in pure bending and tension. A two dimensional (2-D) numerical model was developed using Abaqus Explicit to analyze the affect of skin passing on the residual stress profile across a section for various working conditions. The deformed meshes and their final stress fields were then imported as pre-defined fields into Abaqus Standard, and the post-skin passing material behavior in pure bending was determined. The results show that a residual stress profile is introduced into the steel strip during skin passing, and that its shape and stress level depend on the overall thickness reduction as well as the number of rolling passes used in the skin passing process. The material behavior in bending and the amount of springback changed significantly depending on the skin pass condition.

      • KCI등재SCOPUS

        Device Landscapes-A New Challenge to Interaction Design and HCI Research

        Erik Stolterman,Heekyoung Jung,Will Ryan,Martin A. Siegel 한국디자인학회 2013 디자인학연구 Vol.26 No.2

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